12 THOMAS: INFECTION OF APIUM GRAVEOLENS 
tively dry atmosphere until the infection had largely been thrown 
off. They were again inoculated July 10, nine weeks after the 
first inoculation. The results of both inoculations are shown in 
TABLE III. The lower counts on the second inoculation may be 
TABLE III’ 
DECREASE IN INFECTION UPON PLANTS TREATED WITH CALCIUM SULFATE 
| = 
| First inoculation Second inoculation de cnek. Fae, 
Plant No, eT | Secor eon eee j first inocu- | second 
; 2 3 4 | 5 | Oop d a fe gee | 5 6 lation | inoculation 
| paclnwer, Weitere SNe raea Diner PADRES EAN oy rkee a 
| j | | | ] 
ca 6 WEN teri 387/281 266 301 271 505, 87 28} 56) 14) 80} 79| 335.1 | 57.3 
Controis: (623) 368 495|350/342 382 94 |T13|172, 99 | 80 | 36 426.6 | 
99.0 
explained partly by the fact that the plants had by this time be- 
come pot bound and partly by the influence of seasonal conditions, 
for during the warm weather of midsummer, no high infection 
counts were obtained on any plants in the greenhouse regardless 
of their condition. It will be seen that there is a consistent de- 
crease in the counts on the treated plants from both inoculations. 
The plants were not appreciably altered in appearance by this 
application. 
TABLE IV 
INFECTION OF FEEDING WITH VARIOUS FERTILIZERS AND IN ONE CASE 
TOP DRESSING WITH LIME 
* 
EFFECT UPON 
a” Average 
Plant No 5 be 3 4 5 6 3 age as °. 
le : 7 9 | 10 o. 
leaves. | Spots 
per leaf 
Controls 
REPO; fa 506/412) 778/318! 385 925 L117 592|144/362| 6.5 85.2 
Ca(NOsz)2 andKNO; 64 ‘ 
Complete nutrient 
Solution 22.3 559\662'1,237/276\r 9\1,242) 543] 403.247.4290 6 95: 
Sheep manure 494/772) 461/576) 522 5.0 | 113.0 
Hydrated lime 
(CaO oo: 103/259 518/304 430 5:6 | 60.8— 
With these results in mind further tests were planned to include 
complete fertilizers as well as their components. A nutrient 
solution was prepared according to a Pfeffer formula G7): 4: 
gm. calcium nitrate, 1 gm. potassium nitrate, 1 gm. magnesium 
sulfate, I gm. potassium acid phosphate, 0.5 gm potassium ‘chlo- 
_ tide, trace of ferric chloride, were dissolved in 3 liters of water. 
